Mining-machine bit.



R. E. NOBLE. MINING MACHINE BIT. APPLICATION FILED MAB. 15, 1909.

976,835. Patented Nov. 22, 1910.

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.to provide a new an which will be stronger inproportion to the RALPH E. NOBLE, OF CHICAGO, ILLINOIS, .ASSIGNOR T0 MORGAN-GARDNER ELECTRIC COMPANY, OF CHICAGO, ILLINOIS.

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Specification of Letters Patent.

. 01-13mm! gpplication'filed October 14, 1907, Serial No. 397,348. iiiviaea and this Y 1909. Serial No; 484,200.

Patented Nov. 1910. application filed March 18,

To all whom it may concern:

Be it known that L RALPH E. Noemi, a citizen of the United States, residing at Chicago, in the county of Cook and State'of Illinois, have invented certain new and useful Improvements in Mining-Machine Bits, of which the following is a specification.

This invention relates to the bits or cutters used in connection with chains on minportance, as, when such thickening or bulge ing machines for cutting coal .or the like.

The objects of the resent invention are useful form of bit amount of stock used therein than the bits commonly used heretofore; to provide a bit which may be easily formed and readily sharpened; which will be exceedingly effective in operation, being made in such form that there will be a large amount of back clearance, so that there is little or no danger of the sides of the bit rubbing against the sides of the kerf; and also to provide a form of bit in which the shank will be rigidly held in a correspondingly shaped socket in the bit link.

In order that this invention may be readily understood, I have illustrated it in the accompanying drawings, in which- Figure 1 is a side view of a bit embodying this invention; Fig. 2 is a top plan view of the same; Fig. 3 is an end view as seen from the left-hand end of Fig. 1; and Fig. 4c is an end View as seen from the right-hand en of Fig. 1. v

The bit proper has a shankportion 5 which is formed of stock so that the front or cutting face indicated at 6 is wider than the backface or edge indicated at 7, the sides 8 converging backwardly from said front or cutting face. These sides 8 may be straight, as indicated in Fig. 3, or otherwise formed in order to give the desired convergence or clearance, The body portion of the shank 5 is provided with a forwardly curved cutting portion 9 terminating in a extends out to perform the cutting, so that only a portion of the front or cutting'face 6 for instance the right-hand end, as indicated in Fig. 1, comes in "actual contact with the coal or other material to out the same; but

ing occurs, the sides require considerable grinding or else are apt to rub on the sides of the kerf. Furthermore, these bits may be readily re-sharpened in the mines, without resort to special sharpening apparatus.

This form of bit is especially adapted for use in cutting what is sometimes termed woody or dead coal, that is, coal which is not of a brittle nature but which is preferably chiseled or scraped out the full width of the kcrf in order to make the out.

The manner in which this bit is secured in the chain links or blocks is clearly shown in my former application filedOctober 14, 1907, of which this is a division, in which application this form of bit, as well as a piclcpoint bit, was shown as applied to the chain.

Having thus described my invention, what I claim and desire to secure by Letters Patent' is:

1. A bit for mining machines having a front or cutting face and having acutting portion curved forwardly from the body portion and terminating in a relatively wide cutting edge, said body portion being'tapered back fromthe front or cutting-face and the cutting portion'also converging backwardly from the front or cutting face.

2. A- bit for mining machines, comprising a bar of suitable material having-a front or cutting face, with sides converging backwardly from said front or cutting face to the back edge thereof, and having one end curved forwardly to form a cutting portion, said cutting portion terminating in a relatively sharp edge, the sides of said cutting portion also converging backwardly from the cutting face.

RALPH n. NOBLE. W'itnesses:

A. W. FENs'rEMAKnn, L. LANG. 

